Uh, sorry, I'm new just in case that wasn't obvious. Thank you ACE, for adding the tags for my code.
The submit button on the form (made from code I bought from Forms4free) didn't work, and Forms4free said I'd left part of it out. They replaced the missing code, tested it on their server and I received their submitted test form via email as I should.
I uploaded their code to Godaddy (my web host) and it now partially works. If you leave a required field blank, you get the expected warning message. However, with the form correctly filled out, the submit button now takes you to a page with the message "there was an unknown error while sending email". What should appear, with a correctly filled form submitted, is a "thank you" page.
I've compared my php file to Godaddy's help page verbage, and none of it makes sense to me. Thank you all in advance.